fix: replace TODO placeholders in next-solver IrPrint with proper formatting#21779
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ChayimFriedman2 merged 2 commits intorust-lang:masterfrom Mar 20, 2026
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seven IrPrint::print_debug implementations in the next-solver were placeholder stubs that returned "TODO: <typename>" instead of meaningful output. these are called via the Display impl (and Debug for PatternKind) of these types, so any solver trace log containing them was unreadable. implemented proper formatting for each: - TraitPredicate -> "T: Trait" / "!T: Trait" - HostEffectPredicate -> "const T: Trait" / "[const] T: Trait" - NormalizesTo -> "AliasTerm(...) -> Term" - SubtypePredicate -> "A <: B" - CoercePredicate -> "A -> B" - FnSig -> "fn([inputs]) -> output" - PatternKind -> "start..=end" / "or([...])" / "!null" also removed the now-unused type_name_of_val import.
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| t: &ty::CoercePredicate<Self>, | ||
| fmt: &mut std::fmt::Formatter<'_>, | ||
| ) -> std::fmt::Result { | ||
| fmt.write_str(&format!("TODO: {:?}", type_name_of_val(t))) |
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This prints the same as NormalizesTo, so I think it's better to qualify both, e.g. something like CoercePredicate({:?} -> {:?}).
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@ChayimFriedman2 done |
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seven
IrPrint::print_debugimplementations in the next-solver were placeholder stubs that returned "TODO: " instead of meaningful output. these are called via the Display impl (and Debug for PatternKind) of these types so any solver trace log containing them was unreadable.implemented proper formatting for each:
also removed the unused
type_name_of_valimport.